Toshiba TLCS-900/H1 Series Manual page 272

Below is the transmitting sequence in single packet mode.
Wait transmission event
Transmitting number > payload
• Write payload number in relevant endpoint
• Total = Total − payload
If transmitting number reach to payload,
UDC sets "1" to relevant bit
of DATASET register.
When receiving In-Token from USB Host,
UDC transmits data.
Figure 3.10.14 Transmitting Sequence in Single Packet Mode
IDLE
DATASET register
• Check bit of EPx_DSET_A
Distinction
transmitting
number
Transmitting number ≤ payload
• Write transmitting number in relevant endpoint
• Total = 0
EOP register
Clear relevant bit of DATASET register
92CH21-270
Transmission event
Write 0 to only bit of relevant endpoint
UDC sets "1" to relevant bit
of DATASET register.
Return to IDLE
• Accessing to EOP register is needed in
transmitting short packet.
• Acessing endpoint0 is used for showing
closing control transfer.Therefore,always
access to endpoint 0 in closing control
transfer whether short packet or not.
TMP92CH21
2009-06-19